Which of the following changes with a change in temperature?

(1) Mole fraction

(2) Formality

(3) %(W/W)

(4) Molality

When the solute is present in trace quantities the following expression is used

1. Gram per million

2. Nanogram percent

3. Microgram percent

4. parts per million

Increasing the temperature of an aqueous solution will cause

(1) Decrease in molality

(2) Decrease in molarity

(3) Decrease in mole fraction

(4) Decrease in % (w/w)

During depression in freezing point in a solution, the following are in equilibrium.

(1) liquid solvent, solid solvent

(2) liquid solvent, solid solute

(3) liquid solute, solid solute

(4) liquid solute, solid solvent

When the attraction between A — B is more than that of A-A and B— B, the solution will show deviation from Raoult’s law:

(1) Positive

(2) Negative

(3) No

(4) Cannot be Predicted 

The azeotropic mixture of water and ethanol boils at 78.15 ^oC. When this mixture is distilled, it is possible to obtain-

1. Pure H₂O

2. Pure C₂H₅OH

3. Pure H₂O as well as pure C₂HOH

4. Neither H₂O nor C₂H₅OH in their pure state 

The vant Hoff factor 'i' accounts for

1. the extent of dissociation of solute

2. the extent of dissolution of solute

3. the degree of decomposition of solution

4. degree of solubilization of solute

The solution which has the lowest freezing point is 

(1) 0.1 M potassium nitrate

(2) 0.1 M aluminium sulphate

(3) 0.1 M potassium chloride

(4) 0.1 M potassium sulphate

Maximum freezing point will be for 1 molal solution of assuming equal ionization in each case:

(1) [Fe(H${}_2$O)${}_6$]Cl${}_3$

(2) [Fe(H${}_2$O)${}_5$Cl] Cl${}_2$.H${}_2$O

(3) [Fe(H${}_2$O)${}_4$Cl${}_2$]Cl.2H${}_2$O

(4) [Fe(H${}_2$O)${}_3$Cl${}_3$].3H${}_2$O

The number of moles of sodium hydroxide present in 2.5 L and 0.5 M aqueous solution will be

(1) 1.25

(2) 0.5

(3) 12.5

(4) 5